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CDCM6208: CDCE62005 vs CDCM6208

murad qahwash
Genius 3770 points
Part Number: CDCM6208
Other Parts Discussed in Thread: CDCE62005,

Hi all,

I used 2 CDCE62005 in cascade in one design where one of the differential outputs of one CDCE62005 is used as the PRIREF+/- of the other one...I only placed 0.1uF caps in between...Now, we are using 2 CDCM6208 instead and wonder if can use the same setup (just the caps) or if I need any biasing network in between!?...Please advise.

Regards,

Murad

  • 0
    TI__Mastermind 32575 points

    Hello,

    CDCM6208's PRIREF and SECREF inputs do not have internal input biasing.  So, if your clock driver is AC-coupled to the PRIREF or SECREF inputs, you need to provide external biasing network.  Otherwise, you could use a DC-coupled interface if your clock driver's output levels are compatible with the input levels of the CDCM6208. Note that CDCM6208's PRIREF and SECREF input buffers have multiple register-configurable modes that affect the input voltage swing and common mode voltage.  Refer to the datasheet electrical specification table for those details.

    Regards,
    Alan

  • 0 in reply to Alan O
    Genius 3770 points
    Thank you Alan for the prompt response!
    I am using Y4 of CDCM_1 to be the input to the PRIREF of CDCM_2. if I configure Y4 to be LVDS and replace the 0.1 caps with 50 ohm resisters, would that work?...Also, Y4 is selected as the PRI of CDCM_1 which is 10 MHz.

    Regards,

    Murad